A bridge dynamic weighing method and dynamic weighing system based on long gauge fiber grating sensing technology

Abstract

The invention discloses a bridge dynamic weighing method based on the long-gauge fiber grating sensing technology and a bridge dynamic weighing system thereof. The dynamic weighing method comprises the steps that long-gauge sensors are arranged: the long-gauge sensors are arranged on the initial entering and final exiting side span units of a vehicle and the part between the two side span units along the length direction of the bridge; load condition monitoring of a vehicle to be identified and load condition monitoring of a standard vehicle are performed: the vehicle of which various parameters are known acts as the standard vehicle, the strain response data of each sensing unit under the load condition of the standard vehicle are acquired, and the maximum strain of each sensing unit only caused by the axle load is calculated; and vehicle load identification under the load condition of the vehicle to be identified is performed. The maximum bending strain value only caused by the axle load under the load condition of the standard vehicle is analyzed and compared with the corresponding value under the load condition of the standard value so that the total weight of the driving load on the bridge and the load of each vehicle can be identified, the overload vehicle can be effectively pre-warned and thus damage to the big long-span bridges can be avoided.

Description

technical field

[0001] The invention relates to a bridge dynamic weighing system based on long-gauge optical fiber grating sensing technology, which can realize real-time monitoring of the load of moving vehicles on the bridge and effectively warn overloaded vehicles. Background technique

[0002] Bridges are an essential part of road and rail networks. In recent years, with the continuous development of social economy, vehicle overload has become one of the main reasons for bridge collapse. The repeated driving of overloaded vehicles seriously threatens the infrastructure safety of the bridge deck, and significantly accelerates the fatigue degradation of the bridge. Especially the old bridges, which account for a large proportion of the bridges in the country, will be seriously damaged or even collapsed under the action of overloaded vehicles due to the continuous decline of resistance. At the same time, considering the ever-increasing maintenance and management costs of ...

Examples

Embodiment 1

[0106] Take a simply supported box girder bridge as an example. The length of the bridge is 50m, the section is a single-box single-chamber section, the width of the bridge deck is 12.5m, and the height is 1.5m. The bridge is divided into 25 units, each unit length is 2.5m, the gauge length of the long gauge strain sensor can be determined to be 2.5m, and there are 25 sensors in total. Finite element analysis software is used to verify the identification results of the present invention under multiple load conditions of mobile vehicles, and the strain response data of each unit is extracted under 5% noise.

[0107] According to the inventive method to be disclosed, the moving load on the bridge is dynamically weighed through the following steps:

[0108] (1) Conduct multi-vehicle moving load tests on the structure. The load conditions of the three vehicles: Vehicle 1, with a total axle load of 190kn, first drives on the bridge at a speed of 25m / s; vehicle 2, with a total axl...

technical field

[0001] The invention relates to a bridge dynamic weighing system based on long-gauge optical fiber grating sensing technology, which can realize real-time monitoring of the load of moving vehicles on the bridge and effectively warn overloaded vehicles. Background technique

[0002] Bridges are an essential part of road and rail networks. In recent years, with the continuous development of social economy, vehicle overload has become one of the main reasons for bridge collapse. The repeated driving of overloaded vehicles seriously threatens the infrastructure safety of the bridge deck, and significantly accelerates the fatigue degradation of the bridge. Especially the old bridges, which account for a large proportion of the bridges in the country, will be seriously damaged or even collapsed under the action of overloaded vehicles due to the continuous decline of resistance. At the same time, considering the ever-increasing maintenance and management costs of ...

Examples

Embodiment 1

[0106] Take a simply supported box girder bridge as an example. The length of the bridge is 50m, the section is a single-box single-chamber section, the width of the bridge deck is 12.5m, and the height is 1.5m. The bridge is divided into 25 units, each unit length is 2.5m, the gauge length of the long gauge strain sensor can be determined to be 2.5m, and there are 25 sensors in total. Finite element analysis software is used to verify the identification results of the present invention under multiple load conditions of mobile vehicles, and the strain response data of each unit is extracted under 5% noise.

[0107] According to the inventive method to be disclosed, the moving load on the bridge is dynamically weighed through the following steps:

[0108] (1) Conduct multi-vehicle moving load tests on the structure. The load conditions of the three vehicles: Vehicle 1, with a total axle load of 190kn, first drives on the bridge at a speed of 25m / s; vehicle 2, with a total axl...

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